- SR 40 DUAL: Two receivers in a single case minimize space requirements and cost
- SR 40 DUAL: Multichannel capability for simultaneous use of up to seven channels
- PT 40 PRO: Single-battery powering miniature transmitter
- HT 40 PRO: Transmitter operates for at least 30 hours off a single AA size battery, saving cost, maximizing dependability
- C 444: Ergonomically optimized behind-the-neck headband